Evaluating Clinical Rating Scales for Evidence-Based Dermatology: Some Basic Concepts
Evidence-based dermatology has necessitated the development of rating scales that measure multidimensional and abstract constructs, such as quality of life. This article discusses some basic psychometric concepts, such as reliability, validity, standardization, and measurement precision, which need to be considered when choosing a clinical rating instrument. Also discussed is the impact of these parameters on increasing the statistical power of a clinical trial.
Madhulika A. Gupta, Andrew M. Johnson, and Mary-Margaret Chren. "Evaluating Clinical Rating Scales for Evidence-Based Dermatology: Some Basic Concepts" Dermatologic Clinics 23.4 (2005): 703-706.
Available at: http://works.bepress.com/andrewjohnson/33